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Sizing pipe threaded elements

by guideonl
Tags: elements, pipe, sizing, threaded
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guideonl
#1
Feb27-11, 11:46 AM
P: 17
Hi to everyone,

I have a problem with sizing pipe threaded elements. I am looking for guide rules that with a simple external meassurement I'll be able to determine the element size such as safety valves,threaded pipes,pressure gages,caps etc.
To clarify my question, hereby an example, when I meassure 1/2" safety valve, I can't relate the 1/2" to the actual possible meassurements (ext/int dia) of this valve.
The same problem, when meassuring a threaded hole in a vessele..
I hope that I need not to take several meassurements (ext&int dia, thickness, pitch, number of threads per inch...) and than look at the tables to which size it fits.

Thanks, Guideon
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edgepflow
#2
Feb27-11, 11:49 AM
P: 688
The threads are probably National Pipe Thread Taper (NPT). You can find dimension charts online.
Unrest
#3
Feb27-11, 10:18 PM
P: 360
Quote Quote by guideonl View Post
simple external meassurement I'll be able to determine the element size such as safety valves,threaded pipes,pressure gages,caps etc.
I once made a keyring with a set of threads on it, then I could just line them up with whatever I wanted to check.

guideonl
#4
Feb28-11, 07:19 AM
P: 17
Sizing pipe threaded elements

Thanks, Guideon
xxChrisxx
#5
Feb28-11, 08:51 AM
P: 2,055
This sort of thing is done by standard. You can use loads of different thread types. NPT are good for about 10k psi if I remember correctly. Above that you'll need to use something different.

Look at a catalogue of someone who sells connetors. So Swagelok, Autoclave engineers, etc.


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